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[quote]QUOTE: <i>Originally posted by Overmod</i> <br /><br />That's one thing they do. You might think they'd 'wash' out, but not so... <br /> <br />More important, in my opinion, is that they get in between the pieces of ballast and spoil the integrity of what the ballast does. <br /> <br />Remember that plain old dirt has lots of rocks in it. Too much dirt in ballast essentially gives you track that might as well be laid on... dirt. <br /> <br />Fines in and around the ballast can physically work in between the rocks, and (via a variety of mechanisms) makes the trackwork less stable. There are aspects of physics which make migration of fines upward into ballast happen (I won't bore everyone going into them) <br />[/quote] <br /> <br />OK. If the FINES get in the ballast can the track start to shift/float as if on ice? How often does the ballast need to be cleaned or replaced?
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